Tag: programming

JavaScript Object Literal is a comma separated list of name-value pairs enclosed within a curly braces, means of encapsulating lots of data under a namespace, where the name is a valid variable name and the name can be used as variable. Values can be of any data type, including array literal and object literal.

A namespace is a context for identifiers, simply a namespace is an abstract container for items such as names, objects etc. Also within a namespace, the components can not share the same name.

Encapsulation, In his influential book on object-oriented design, Grady Booch defined encapsulation as “the process of compartmentalizing the elements of an abstraction that constitute its structure and behavior; encapsulation serves to separate the contractual interface of an abstraction and its implementation.”

In the avobe example the “BlogPost” object created using object literal notion with some properties. Thus the property values can be manipulated using methods sharing the namespace. Further adding property or methods are simple enough.

Like this:

JavaScript has bunch of cool features; one of them can be self executing functions. 🙂

Also this self invocation feature could be surrounded by the best practices for JavaScript.

Let’s have an example of an anonymous self invoking function:

(function(){
var test = 2;
alert(test);
})();

Here, test variable has its own local scope, means it doesn’t interface with or pollute global scope and it dies out(remains as long as there’s somewhere in the page or in an event that references the variable you declared in your closure: Thanks Dan Beam for this correction 🙂 ) when the function terminates.

Self-invocation (also known as auto-invocation) is when a function executes immediately upon its definition. This is a core pattern and serves as the foundation for many other patterns of JavaScript development.

I am a great fan 🙂 of it because:

It keeps code to a minimum

It enforces separation of behavior from presentation

It provides a closure which prevents naming conflicts

Enormously – (Why you should say its good?)

It’s about defining and executing a function all at once.

You could have that self-executing function return a value and pass the function as a param to another function.